Just a simple and thoroughly tested float handle for action cameras.
I've printed a few iterations of this for myself and friends and it works great, even with the older heavier GoPro Cameras that I have.
Print in a nice bright colour and add some cord to the lanyard attachment point and never be worried about losing your camera in the water again!
The handle is hollow and must be printed with supports. The camera attachment is separate to allow you to print lying flat so it is not likely to snap. The camera attachment is a tight fit but should still be glued in with something designed for prolonged use in water.
If printed out of PLA / PETG I recommend sealing the handle with a good water proofing sealant, if printing out of ABS / ASA, vapour smoothing or brushing with acetone tends to create a nice seal.